Schedule adherence impact calculator
Quantify the FTE equivalent and annual cost of below-target schedule adherence. A 5pp adherence gap across 50 agents is over 2 FTE of productive capacity paid for but not working.
Schedule adherence impact calculator
Quantify the FTE and cost impact of below-target adherence
Agents scheduled in the period you're analysing
Hours per scheduled shift
Current measured adherence rate
Your adherence target (typically 90–95%)
All-in cost including employer NI and pension
One shift — 50 agents × 8h
Scheduled hours
400h
Effective hours (actual)
364h
Hours at target
372h
Hours lost vs. target
8h
Impact summary
2.0pp gap — each agent is missing 10 minutes per shift
That is 10 minutes of lost productive time per agent per day. Across 50 agents it compounds to 1 effective FTEs not working to schedule.
What this calculator models
FTE lost per shift
How many full-time equivalents of productive capacity are lost when adherence falls below target — expressed as a fraction of an agent shift.
Daily and annual cost
The financial cost of the adherence gap using your all-in hourly agent cost — including NI, pension, and on-costs. Annualised over 260 working days.
Minutes missed per agent
How many minutes of scheduled time the average agent misses per shift at the current adherence gap — a concrete number supervisors can discuss with agents.
Why schedule adherence matters for staffing
Schedule adherence is the difference between the staffing model (what Erlang C assumes) and the staffing reality (what is actually on the phone). Every Erlang C calculation assumes agents will be available as scheduled. When they are not, the service level degrades.
Adherence is not a HR metric — it is a capacity metric
Every agent-minute of non-adherence is a unit of capacity that was bought (via salary) but not delivered. A 5pp adherence gap across 50 agents removes 2.5 FTE of capacity from the operation per shift. That FTE would need to be replaced with overtime or agency to maintain service level.
The Erlang C model cannot account for adherence
Erlang C calculates agents required assuming all scheduled agents are available. Shrinkage adjustments cover planned absence (leave, training), but adherence problems are not planned — they are real-time deviations from schedule. The correct fix is a real-time adherence dashboard, not a higher shrinkage budget.
Adherence problems compound service level problems
Poor adherence reduces effective staff precisely when agents are most needed — during high-volume periods. Agents who arrive late from break, extend wrap time, or remain offline during intraday peaks cause double damage: fewer agents available when volume is highest.
A 93% target is achievable without gaming
93% schedule adherence means agents are on-task and logged in for all but about 34 minutes of an 8-hour shift (above scheduled breaks). This is a realistic, professional target. Targets above 95–96% invite gaming — agents skipping breaks to hit numbers — which drives quality down and attrition up.
Calculator questions
How do you calculate the cost of low schedule adherence?
Lost hours = agents × shift hours × (target % − actual %). Multiply by hourly all-in cost for daily cost, then by 260 working days for annual cost. Example: 50 agents × 8h × 5pp gap = 20 lost hours/day × £14/h = £280/day = £72,800/year.
What is a good schedule adherence target for a contact centre?
90–93% is the industry benchmark, with 91–93% typical for high-performing operations. Targets above 95% can drive gaming — agents skipping breaks — which harms wellbeing and quality. A clearly defined 92% target with real-time dashboard monitoring is more effective than a punitive 97% target with no visibility.
How many FTE does poor schedule adherence remove?
FTE lost = agents × (target% − actual%) / 100. Example: 50 agents at 88% vs. 93% target = 50 × 5% = 2.5 FTE equivalent lost per shift. That is 2.5 agents paid for but not productively available.
What causes low schedule adherence in contact centres?
Extended ACW/wrap without discipline, overlong breaks, late returns from lunch or training, system login delays (PC/CRM boot time), unofficial coaching, and personal time not visible to supervisors. Real-time adherence dashboards (ACD data vs. schedule) allow supervisors to address issues as they happen rather than reviewing yesterday's report.
Related calculators and guides
Shrinkage calculator
Planned absence gross-up for agent count
Staffing cost calculator
Total FTE cost model
Adherence explained
What it is, how it's measured, benchmarks
Erlang C calculator
Agent count based on volume and AHT
Intraday management
Real-time response to adherence deviations
CC benchmarks
Adherence benchmarks in context
Track adherence costs alongside your full staffing plan
The free calculator quantifies a single adherence gap. Turnella connects schedule adherence to your coverage model so you can see the impact of deviations on service level.